Reduce the area of coverage of wireless cards

Hello:

I'm currently involved in a project that demostrates the multi hop function 
in a mobile ad hoc network. However considering the large area of coverage 
as well as the limited test area that we have, we are kind of unable to 
demostrate to demostrate the multi hop function. We are looking into ways to 
reduce the area of coveage of each wireless cards. As such, i was wondering 
if any of the stargates users have any ways of reducing the area of coverage 
of the PCMCIA wireless cards?

One of the method i heard of is to used Aluminium foil to wrap around the 
wireless cards.

Is there any other effective ways of reducing the area of coverage of the 
PCMCIA wireless cards?

Any suggestion are welcomed

Thank you

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